JPS60204586A - Lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temporary lift device used mainly for loading and unloading construction materials during the construction of high-rise buildings and the like.

In recent years, construction of high-rise buildings including skyscrapers has become widespread, but in order to construct these high-rise buildings in a short period of time and efficiently, it is necessary to unload and unload construction materials. A large-scale temporary lift device for use in transportation is attracting attention. This type of temporary lift device has various features, including loading capacity and platform dimensions, (11) to ensure efficient loading and unloading in a short period of time.
It is extremely important that the lifting speed is fast, and that the equipment stops accurately on the floor so that materials can be loaded and unloaded quickly and safely, that is, that the landing accuracy is high.

By the way, when increasing the lifting speed of this type of glide device, it is important to consider the starting torque of the drive device used, that is, the motor, the impact load applied to the loaded object or the device itself such as the loading platform, and the collapse of the loaded object. Taking this into consideration, speed control is performed so that the engine is not started and stopped all at once, but is gradually accelerated, decelerated, and stopped in the following order: start → low speed → medium speed → high speed operation → medium speed operation → low speed operation → stop. There is.

FIG. 1 is a diagram showing a speed pattern of speed control during upward deceleration in a conventional lift device. As shown in this figure, when raising the loading platform to the target floor nF, high-speed operation is performed until the loading platform reaches the (n-1) F floor, which is one floor before the target floor nF. When passing a floor is detected by limit fire inches, etc., the climbing speed is switched to medium speed and decelerated, and after a certain period of time T from this switching time, the climbing speed is reduced from medium to low speed using a busy timer device, etc. ,
When the target floor nF is detected by a limit switch or the like, it is stopped. However, with such speed control, the journey for at least one floor must be performed at medium or low speeds, so it has been difficult to shorten the lifting time.

Furthermore, in the speed control described above, since the timing of switching from medium speed to low speed is fixed by a timer device, there is a problem that the low speed operation period changes depending on the floor height of the building, especially when the floor height is When the speed is high, the low speed period becomes very long, causing the problem that the lifting time becomes even longer. This problem has been a major obstacle in terms of work efficiency, especially in devices such as temporary lift devices that must be applied to a variety of pills with different floor heights. This problem also occurs when descending and decelerating, but there is no problem when starting up and descending.

In order to solve the above problem, it is possible to install, for example, three limit switches for speed switching on each floor and use them to control the speed. Providing a large number of limit switches is extremely disadvantageous in terms of installation work, cost, and reliability.

This invention was made in view of the above-mentioned problems, and its purpose is to shorten the lifting and lowering time, thereby increasing work efficiency.
To provide a lift device that is highly reliable, easy to install, and extremely excellent as a temporary device.

Hereinafter, embodiments of the lift device according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a diagram showing an outline of an embodiment of the lift device according to the present invention. In this rotating pressure, the loading platform 1, that is, the carrier is guided by the guide rail 2 attached to the building, and the drive device 3 It is designed to be raised and lowered by In the figure, reference numeral 4 indicates a counterweight truck, and the carrier 1, drive device 3, and counterweight 4 are interconnected using wires and pulleys. Further, 5 is a control panel for operating this lift device.

Next, FIG. 3 is a block diagram showing the relationship between the drive device 3 and the control panel 5. As shown in FIG. 1 control panel 5 as shown in this figure
has a built-in program controller 6. The program controller 6 includes an arithmetic device, a storage device,
It has an input/output module, a detachable keyboard, a display device 7, etc. Further, on the panel surface 5a of the control panel 5, there is a floor number display 8 that displays which floor the carrier 1 is on, and a display that displays the number of times the material has been transported by the carrier 1. A graphical board 10 for graphically displaying the functions of the device 9 and each part of the device is provided, and the panel surface 5b of the control panel 5
includes a floor setting device (for example, a digital switch) 11 for setting the destination floor number (target floor) of the carriage 1 and a floor setting device 11 for setting the destination floor (target floor) of the carriage 1.
A push button switch group 12 is provided for issuing various commands such as an automatic operation command and an emergency stop command. and,
Each part of the panel surfaces 5a and 5b mentioned above is connected to the arithmetic unit of the programmable controller 6 via the input/output module. The programmable controller 6 also includes a proximity switch LSO, which will be described later.
, LSH, LSL, and the like are inputted via the input module.

Also, as shown in FIG. 3, the drive device 3F! ,, a thyristor comprising a thyristor circuit 14, a reversible electromagnetic contactor 15, etc., a seventh-order voltage control device 16, a three-phase wound induction motor 17 driven by this control device 16,
AC electromagnetic brake 18 for braking this electric motor 17
, and a tacho generator 19 for detecting the rotational speed of the electric motor 17. Starting, stopping, and rotational speed of the electric motor 17 are freely controlled by the output of the programmable controller 6. The thyristor next voltage control device 16 includes a limit switch for emergency stop.
The push button circuit 20 cuts off the power supply.

Next, FIG. 4 shows the positional relationship between the proximity switch provided on the carrier 1 and the detection dog provided on the guide rail 2, and the
the positional relationship between the detection dog attached to the guide rail 2 and the proximity switch and limit switch provided on the guide rail 2;
1 and 2 are diagrams showing speed patterns of the carrier 1. FIG. As shown in this figure, two proximity switches LSL (upper side) and LSH (lower side) are provided on the right side of the carrier 1 at a predetermined distance from each other in the vertical direction. In addition, the proximity switch LSL is located at a position corresponding to each floor of the right guide rail 2.
Detection dogs D1 (for first floor detection), D2 (for second floor detection), ...Dn (for nth floor detection), ...DN (for top floor detection) in the positional relationship corresponding to LSH. ) are attached to each. In this case, in the case of the detection dog D1 for detecting the first floor, for example, when the carrier 1 is accurately positioned on the floor surface of the first floor, each detection dog is connected to the proximity switch LSLSL.
They are mounted in such a positional relationship that both SH detect the detection dog D1. On the other hand, a detection dog Do is attached to the outside of the left side plate of the carrier 1. The left guide rail 2 is equipped with one proximity switch LSO and six limit switches LSO corresponding to this detection dog DO.
SLLI, LSLL2. LSLL fable LSH) (1, LS
HH2 and LSHH3 are installed respectively.

In this case, the proximity switch LSO is located at a position where the detection dog Do is detected when the carrier 1 is correctly located on the first floor, the limit switch LSLLI is located a predetermined distance above the detection dog Do, and the limit switch LSLL2 is located a predetermined distance below the proximity switch LSO. Furthermore, the limit switches LSLL3 are each installed a predetermined distance below the limit switch LSLL2. Note that the limit switch LSLLI is used to forcibly reduce the speed of the carrier l when it descends.
L2 is for forcibly stopping the decelerated carrier 1.
In addition, limit switches LSLL3 are provided to bring the carrier 1 that does not stop to an emergency stop. In exactly the same way, a limit switch LSHHI is located a predetermined distance above the floor surface of the top floor NF for forcibly decelerating the ascending carrier 1, and a predetermined distance above the limit switch LSHHI is a limit switch for forced stop. limit switch LS
Emergency stop limit switches T and SHH3 are respectively installed at a predetermined distance above limit switch LSHH2.

Next, FIG. 5 is a circuit diagram showing the configuration of a current value detection circuit for detecting which floor the carrier 1 is currently located on. In this figure, the output of the proximity switch L8L provided on the carrier 1 is added to the current value counter 23 via the AND gate 22 during the ascending operation, that is, when the ascending signal U is output, and on the other hand, during the descending operation, that is, when the ascending signal U is output. If a falling signal is being output, it is subtracted and input to the current value counter 23 via the AND gate 24. The current value counter 23 is set to a value of 1'1 by the output of the proximity switch LSO, that is, each time the carrier 1 reaches the first floor.
Similarly, the output of the proximity switch LSH is added to another current value counter 26 through an AND gate 25 during upward operation.
During descending operation, the current value is subtracted and input to the current value counter 26 via the AND gate 27. This current value counter 26 is also reset to '1'' by the output of the proximity switch LSO.Therefore, from these current value counters 23 and 26, the floor number where the carrier 1 is currently located, that is, the current value n and n' are output respectively.These current values n and n' are constantly compared by a circuit (not shown), and when the difference between these two values becomes 1 or more, it is determined that the position detection is abnormal. Yes, each of the above circuits is
It is constituted by the programmable controller 6.

Next, the operation of this lift device configured as described above will be explained in the flowchart shown in FIG. 6 and in Section 4. This will be explained with reference to FIG.

Now, suppose that a new target floor number S is set on the control panel 5 via the floor number setter 11, and automatic operation is commanded via the push button switch group 12. In this case, in block B1 of FIG. 6, it is determined whether (S-n) is positive or negative, and it is determined whether the operation is upward or downward.

Hereinafter, the case where (S-21) is positive, that is, the case of upward operation will be explained.

When it is determined that the vehicle is ascending, it is then determined whether (S-n) is greater than 1, that is, whether the ascending is one floor or more (block B2). Here, if it is determined that the climb is one floor or more, high-speed ascending operation is started at the speed Vh (block B3), and then n= (S-1), that is, the carrier 1 is moved to the target floor SF. It is determined whether or not the floor (S-1)F, which is the first floor before the floor, has been reached (block B4). Here, if the first floor has not yet been reached, the high-speed ascending operation continues, and when it reaches the first floor (this time is now referred to as tl), a time Tu (this time Tu indicates the keyboard person car display device 7) is reached. ) is pre-stored in the programmable controller 6 via the programmable controller 6.
When this time Tu elapses in (block B5),
Switch high-speed ascending operation to speed VmQ medium-speed ascending operation (
Block B6). Next, the state of the proximity switch LSL is determined (block B7), and when the proximity switch LSL is turned on at time t3, the rising speed is medium speed Vm.
to low speed vg (block B8). Next, the state of the proximity switch LSH is determined (block B9.
), when this proximity switch LSH is turned on at time t4, the carrier 1 is stopped (block BIO)
. Next, it is determined whether both the proximity switches LSL and LSH are in the on state (block Bl 1
), positioning is confirmed on the condition that both of these are in the on state (block B12), and the automatic ascending operation ends. On the other hand, if the condition of the block Bll is not satisfied, that is, the carrier 1 has gone too far and stopped, and the proximity switch LSI is on, but the proximity switch L
When SL is in the off state (block B13), a downward inching operation is performed until the proximity switch LSL is in the on state (blocks B14 and B15), and both proximity switches T and SL.

The carrier 1 is stopped with both LSHs in the ON state.

Although the above explanation was given only for the automatic ascending operation, the descending is started at high speed Vh in the same way during the automatic descending operation, and the predetermined time T is reached from the time when the floor in front of the first floor is detected.
After a, the high speed is switched to the medium speed Vm, and then the LSH
When LSL is turned on, the speed is switched from medium speed to low speed Vl, and then when LSL is turned on, it is stopped. In addition, in the above embodiment, the measurement start point of time Tu and Ta was set as the point in time when the current value n coincided with the value of the floor one floor before the target floor. It may also be the time when the values match.

As is clear from the above description, the lift device according to the present invention is configured to decelerate after a predetermined time elapses after the carrier passes a predetermined number of floors before the target floor, and this time can be set arbitrarily. Therefore, the low speed movement period can be set to the minimum value (only the gap between LSL and LSH) and the medium speed movement period can be set to the minimum value even if installed in a building of any floor height, thereby reducing the elevating time. It is possible to significantly improve the lifting efficiency of materials. Further, according to this lift device, in principle only one detector is required to be installed on each floor, so the installation work is easy and it is suitable as a temporary lift device. In addition, according to this lift device, the current floor number is calculated by counting the output of the detector on each floor using an arithmetic and control device. Compared to conventional methods, reliability and durability have been significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the speed pattern of a conventional lift device when it stops lifting, Fig. 2 is a schematic diagram of an embodiment of the lift device according to the present invention, and Fig. 3 is a diagram showing the control panel and drive device in the same embodiment. Figure 4 is a block diagram showing the relationship between
An explanatory diagram showing each of the speed patterns of the carrier, Fig. 5 is a circuit diagram showing the configuration of a circuit that calculates the current position of the carrier, and Fig. 6 is a flowchart for explaining the lifting/lowering control operation of the carrier. Applicant: Yaskawa Electric Corporation Manufacturing site Figure 1 Floor 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (a) A guide rail to be attached to a target building;
←) a carrier supported by the guide rail so as to be movable in the vertical direction; e) a drive device for raising and lowering the carrier along the guide rail; (e) a storage means, a data input means for inputting data into the storage means; It has a timer means that measures time based on data stored in a storage means, and a counting means that counts the output of the detection means, and the counting means outputs the current position of the carrier and the target floor of the carrier. and an arithmetic and control device that controls the drive device based on the output of the timer means, and the arithmetic and control device starts the step of the carriage to the target floor so that the carriage moves to the target floor after a predetermined time from the time of passing. A lift device characterized in that it is configured to shift the moving speed of the carrier to a medium speed, and to shift to a low speed and stop the carrier just before the carrier reaches the target floor.